Watch-balance.



J. A. PETTA.

WATCH BALANGE. APPLICATION FILED MAY 20,1908.

Cutout;

JOHN A. PETTA, OF SEATTLE, WASHIN GTQN.

WATCH-BALANCE.

Specification 01 Letters Patent. Patented M31. 23, 1911.

Application filed May 20, 1908. Serial No. 33,911

To all whom it may concern:

Be it known that I, JOHN A. Perm, a citizen of the United States of America, residing at Seattle, in the county ofKing and State of Washington, have invented new and. useful Improvements in Watch-Balances, of which the following is a specifiea tion.

My invention relates to improvements in -watch balances, and its primary object is the provision of a device of this-character I wherein the stall is secured to the wheel of the balance by means of'th'e roller table, the roller table frictionally engaging the stall, and a hub formed on anddepending from the cross bar of the arm or wheel.

With the above and other objects in View,

the invention consists in the construction,

combination and arrangement of parts here= inafter fully described, claimed and illustrated in the accompanying drawing, where- .Figure 1 is a sectional view taken on a plane extending vertically and centrally through a watch balancesconstructed in ac cordance with my invention, and Fig. 2 is a top plan View of the watch balance, portions of the rear oi the wheel being broken away.

Referring to the drawing by reference numorals, 1 designates the cross bar or arm, and 2 the rim of the-wheel of a watch bal .ance of the usual form and construction.

at a point intermediate its ends'with acircu lar flange 7 which occupies the countersink of the opening 3, and has its ends formed to provide pivots 8. The wheel is secured to the staff 4 against movementthereon by means of a ro ler table 9. The roller table 9 is provided with an opening 10"whiohis of a diameter to, snugly receive the staff 4.

Ihe frictional contact between the wall of the opcning 10 and the staff A is such as to prevent the roller table from turning on, the staff. The" roller table engages the hub 5v with such frictional force as to prevent the wheel from turning on the staff.

It should be apparent from the above description taken in connection with the accompanying drawing, that I provide a watch balance which includes simple, durable and efficient means for securing the wheel onthe staff. It should also be apparent that it is practically impossible to damage the wheel during the securing of the same on the stuff. .The balanoecan be manufactured and sold at a comparatively low cost, as my improved manner of attaching the wheel to the staff does notin any way add tothe cost of manufacture. r

Changes in the form, proportions and minor details of construction may be made Within the scope of the claim without departing from the spirit or sacrificingany of the advantages of the invention Having-fully described and illustrated my invention, what I claim is: x A watch balance wheel comprising a rim having a cross arm provided with a circular recess in its upper face, the side wall oi said recess being vertically disposed at right angles to its bottom, an outwardly tapering boss formed integral with and extending outwardly from the bottom face of the cross arm and having a central bore of considerably less size than the recess zmdint ersecting the latter, a staff snugly fitted in said bore in the boss and having a disk correspondingly shaped to the recess in'the' arm and snugly fitted therein. and a roller table provided with a. central opening snugly receiving the staff and frictionally engaging the adjacent end of the boss.

' In testimony whereof I affix my'signature inpresence of two witnesses.

. o JOHN A. BETTA.

Witnesses i SAD/IL. H. Jonivs'ron, E. V; GEE. 

